//
//  HPYtabBar.swift
//  SwiftVVBo
//
//  Created by hepeiyong on 16/8/10.
//  Copyright © 2016年 hpyhn. All rights reserved.
//

import UIKit

// 声明协议  需要继承NSObjectProtocol
protocol HPYTabBarDelegate:NSObjectProtocol{
    // 声明方法
    func tabBarButtonClick()
}

class HPYtabBar: UITabBar {
    // 声明一个代理
    weak var hmDelegate:HPYTabBarDelegate?

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    // MARK: - 监听方法
    func buttonClick(){
        hmDelegate?.tabBarButtonClick()
        
    }

    // MARK: - 设置视图
    private func setupUI(){
        addSubview(composeButton)

    }
    // 给子控件设置frame
    override func layoutSubviews() {
        super.layoutSubviews()
        // 子控件的宽度
        let childW = self.frame.width * 0.2
        var index: CGFloat = 0
        //UITabBarButton
        // 遍历子控件
        for value in self.subviews {
            // NSClassFromString 通过字符串转class
            if value.isKindOfClass(NSClassFromString("UITabBarButton")!) {
                // 设置frame
                value.frame.size.width = childW
                value.frame.origin.x = index * childW

                index++
                // 为了给撰写按钮留位置
                if index == 2 {
                    index++
                }
            }
        }
        // 设置撰写按钮的frame
        composeButton.center.x = self.frame.width * 0.5
        composeButton.center.y = self.frame.height * 0.5
    }

    // MARK: - 懒加载控件
    // 撰写按钮
    private lazy var composeButton: UIButton = {
        let button = UIButton()
        // 点击事件
        button.addTarget(self, action: #selector(HPYtabBar.buttonClick), forControlEvents: UIControlEvents.TouchUpInside)
        // 设置背景图片
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        // 设置图片
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        // 自适应
        button.sizeToFit()
        return button
    }()
}
